Account for projects with no volunteer photo

* Add a new macro for volunteer photos
* This macro shows the image url if present, and a div with the name/state if not
* Make the text smaller when in the volunteer selection screen
* Typo in peace corps url

![screen shot 2014-12-24 at 12 43 29 am](https://cloud.githubusercontent.com/assets/326918/5546056/01ccda4e-8b06-11e4-9e62-58bfd1059cd9.png)
![screen shot 2014-12-24 at 12 43 36 am](https://cloud.githubusercontent.com/assets/326918/5546058/01cdf546-8b06-11e4-9a8e-46b6673c9635.png)
![screen shot 2014-12-24 at 12 43 57 am](https://cloud.githubusercontent.com/assets/326918/5546057/01cd7c6a-8b06-11e4-8c44-0401cbb75b57.png)